Fix unknown field `author` error when building the book

using mdbook in main (v0.5.x)

```log
2025-08-18 19:56:41 [ERROR] (mdbook_core::utils): Error: Invalid configuration file
2025-08-18 19:56:41 [ERROR] (mdbook_core::utils):       Caused By: TOML parse error at line 2, column 1
  |
2 | author = "The Rust Project Developers"
  | ^^^^^^
unknown field `author`, expected one of `title`, `authors`, `description`, `src`, `language`, `text-direction`
```

Signed-off-by: Hollow Man <hollowman@opensuse.org>
pull/500/head
Hollow Man 4 days ago
parent 3ff3843205
commit 78b10ca040
No known key found for this signature in database
GPG Key ID: 06CA2A0660F48F7A

@ -1,5 +1,5 @@
[book] [book]
author = "The Rust Project Developers" authors = ["The Rust Project Developers"]
title = "The Rustonomicon" title = "The Rustonomicon"
description = "The Dark Arts of Advanced and Unsafe Rust Programming" description = "The Dark Arts of Advanced and Unsafe Rust Programming"

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